As seen at Frankensteinia and elsewhere, the New York Public Library is hosting what looks to be a fantastic exhibition of Shelley circle materials, many on loan from the Bodleian Library at Oxford University. The exhibit runs through Sunday, June 24, 2012.

Selections from the manuscript of Frankenstein, or the Modern Prometheus.
Godwin’s Diary, digitally published with annotations in July 2010
Correspondence between William Godwin and Mary Wollstonecraft
The Esdaile Notebook containing P.B. Shelley's youthful work (Pforzheimer)
Shelley's gold and coral baby rattle
The only known letter from Lord Byron and Claire Clairmont's daughter Allegra, who died at 5.
A necklace owned by the Shelley family with locks (lockets) of P.B. and Mary Wollstonecraft Shelley's hair
Shelley’s first wife, Harriet Westbrook’s engagement ring and her last letter before committing suicide
Percy Shelley’s copy of his first major poem “Queen Mab,” complete with his notes and annotations. The poem was politically-charged, discussing the evils of eating meat and religion, amongst other things. Shelley actually pulled the poem from distribution after it was published, and it was only widely disseminated after his death.